European Central Bank (ECB), European Central Bank (ECB), European Central Bank (ECB), European Central Bank, Banco de España, European Central Bank (ECB), European Central Bank (ECB), European Central Bank (ECB), European Central Bank (ECB), European Central Bank (ECB) - Directorate General Economics, European Central Bank (ECB), WZB Berlin Social Science Center - International Politics and Law, European Central Bank (ECB), CESifo (Center for Economic Studies and Ifo Institute) - Ifo Institute, European Central Bank (ECB), European Central Bank (ECB), European Central Bank (ECB), European Central Bank (ECB), European Central Bank (ECB) and European Central Bank (ECB)